first batch of serious rebellion ##s in 125 ##8 – 60 in south ara ##kan and marta ##ban ( mo ##tta ##ma ) , the decline continued . on the eve of the mongol invasions , between one and two @ - @ thirds of upper burma ' s cult ##iva ##ble land had been donated to religion . the crown ' s ability to mob ##ili ##ze defenses was in serious jeopardy . the period of calm for pagan ended in the early 127 ##0s . by then , the song were on the ropes , and emperor ku ##bla ##i khan , who officially founded the yuan dynasty on 18 december 127 ##1 , sought to cut off the retreat of song refugees in all directions
first batch of serious rebellions in 1258 – 60 in south arakan and martaban ( mottama ), the decline continued. on the eve of the mongol invasions, between one and two @ - @ thirds of upper burma's cultivable land had been donated to religion. the crown's ability to mobilize defenses was in serious jeopardy. the period of calm for pagan ended in the early 1270s. by then, the song were on the ropes, and emperor kublai khan, who officially founded the yuan dynasty on 18 december 1271, sought to cut off the retreat of song refugees in all directions